feeudentheil



G. E. FREUDENTHBIL; Plano Frame Patented April 12,1881.

Inventor.

M WW4! FIG (No Model.)

iii:

Witnesses:

gw p aw W Z;

UNITED STATE PATENT OFFICE.

GUILLERMO E. FREUDENTHEIL, OF HAMBURG, GERMANY.

PlANO-FRAM E.

SPECIFICATION forming part of Letters Patent No. 239,949, dated April 12, 1881.

Application filed June 11, 1880. (No model.) Patentedin Germany February 13, 1880.

T 0 all whom it may concern:

Be it known that I, GUILLERMO EUGENIO FREUDEN'lI-IEIL, of Hamburg, in the German Empire, have invented Impmvements in Iron Frames for Piano-Fortes, (for which I have obtained German patent of fifteen years, from February 13, 1880, No. 8,840,) and I do hereby declare that the following is a full and exact description thereof, reference being made to the accompanying drawings.

Figure l is a top view of my improved piano-forte frame. Fig. 2 is a cross-section on enlarged scale thereof. Fig. 3 is a partial top view of part thereof. Fig. at is a side and a sectional view of the wooden socket-piece for the turning-post; Fig. 5, a top and sectional view of a modification of the adjustable rest.

These improvements comprise a. combination of the following essential elements: the iron frame cast in one piece with the soundpost and double shoes, fastening-plate, and cross-stays. The pins are sunk into wooden sockets inserted into the iron sound-post.

The frame A is cast in one piece with the sound-post a, the fastening-plate f, the double shoe d d, and the cross-stays g. This frame is preserved from any influence of the atmospherical variations, the influence of which is so troublesome for wooden frames, even when they are garnished with iron sheets.

The pins tare sunkthat is to say, they are fastened on the iron sound-stock a--in the following manner, Figs. 2 and 4 of the drawings: After the holes bare bored into the soundpost a they are fitted with sockets c, of hard cross-grained wood. These round or oval sockets are to be puttied or otherwise secured in place, after which they are perforated with holes the diameter of which corresponds to the size of the pins "i, the rotation of which will be more or less easy, according as the holes are larger or smaller. This system renders it impossible for the pins to get rusty.

The parallel double shoes (1, Figs. 1, 2, and 3, cast in onepiece with the sound-post, serve for crossing the strings. Between these shoes lies the metal bar a, by which the strings are held down, the tension being regulated by means of screws h. By this means the strings are stretched in an equal way by a middle pressure, losing at the same time the force which they were exercising under the old system, in consequence of their oblique direction. My cramp, consisting of the parts (I c d, is easy to adjust, and the danger of the warping of the wood is avoided. The modification of this cramp shown in Fig. 5 illustrates a fnrther rest, j, beneath the bar 0, between the shoes d.

The tone of a piano-forte provided with my improvements is excellent and durable. At the same time the sonorousness, the force, and the sweetness of the sounds are favored in a considerable manner by the massive iron frame. Even the weight is less in my construction *5 than in instruments having wooden soundposts, as I am not compelled to make use of cross-stays.

I am aware that the above-described elements, which I claim to have combined, are in themselves old, and I do not claim them nor any of them separately, but only their combination, which produces results not attainable by the separate use of said elements.

I claim In piano-fortes, the iron frame A, cast in one piece with the sound-post a, the fasteningplate f, the cross-stays g, and double shoes d, in combination with the wooden socket 0, pins or posts 1', and with the adjustable bar 0 and screws-7t, substantially as herein shown and described.

In testimony that. I claim the foregoing I have hereunto set my hand this 20th day of October, 1879.

G. l). FREUDENTHEIL.

\Vitnesses:

F. AHR'ENDS, MARTIN OLSEN. 

